William Lane Craig is ubiquitous in conversations about theistic and Christian apologetics. Being the foremost modern philosopher/theologian still operating, he is often called upon or used as a source for theistic and Christian arguments, winning many debates in the process (on technique and rhetoric, in the main). I have part critiqued his Reasonable Faith book here.
Another fascinating video from skydivephil, the pair whom I interviewed here (well worth checking out). This time, the ‘before the Big Bang’ idea is investigated in interviewing Sir Roger Penrose with regard to the cyclical universe.